Worcester 28i Junior Especificações descarregar pdf (Página 10)

Note: This fault-finding information is for guidance only. Worcester Heat Systems cannot be held responsible for costs incurred by

persons not deemed to be competent.

By flashing at various rates, the oval shaped facia light will indicate specific fault conditions. If this is used with other observations during

a fault, then every normal fault can be identified.

To use the fault finding system, use the table below to select the failure condition during your fault. The most common causes are listed,

then refer to the test in the following section. This fault finding system assumes that the appliance has been operating normally until the

time of failure (ie not a first installation fault).

PRELIMINARY CHECKS

Preliminary electrical system checks are the first electrical checks to be carried out during a fault-finding procedure. On completion of

the Service/Fault-Finding task which has required the breaking and remaking of electrical connections, check (a) EARTH CONTINUITY,

(b) SHORT CIRCUIT CHECK, (c) POLARITY and (d) RESISTANCE TO EARTH.

19. Fault Finding

OBSERVED FAULT COMMON CAUSES SEE TEST

No lights and no functions

(with demand)

No CH function (DHW OK)

No DHW function (CH OK)

Flash once per second

Ignition lockout

Overheat lockout

Internal error

Flash 4 times per second

No mains Voltage supply.

Fuse F1 or F2 blown.

Transformer or connector failed.

Board fault.

No link at ST2 Ls to Lr, or failed external control

input to Lr.

Failed programmer.

Board fault.

Flow sensor failure.

DHW sensor (LED 4 flash/second).

Board fault.

No gas or low gas pressure.

Weak spark or spark not across elecrodes.

Gas valve leaking or failed.

Low water pressure or boiler dry.

Pump fail.

Primary sensor position.

Flame sensor fail or connector.

Overheat stat tripped or disconnected or faulty.

Blocked burner.

Blocked heat exchanger.

Faulty harness.

Board fault.

CH or DHW Sensor fault or out of position.

Air pressure switch fault or condense in tubes.

Fan fail or stiff.

Blocked flue.

Faulty harness.

Board fault.

FAULT LIST

Gas Valve mode switch on min or max.

Autofroststat.

Board fault.

Sensor off pipe.

Low gas pressure.

Pot P1 not turned up.

Stiff/sticking gas valve.

Stiff/sticking flow sensor.

Board fault.

Flash 4 times per second

Burner on with no demand

Water temperature too hot

Water temperature too cool

(reset lockout by gently

pressing reset button

for 5 seconds)

No gas or low gas pressure.

Weak spark or spark not across electrodes.

Gas valve leaking or failed.

Low water pressure or dry boiler during normal

operation, standby or directly after power up.

Pump fail.

Primary sensor position.

Flame sensor fail or connector.

Overheat stat tripped or disconnected or faulty.

Blocked burner.

Blocked heat exchanger.

Faulty Harness.

Board fault

It may be necessary to contact the local Water Company before

connecting the appliance.

Where back-flow prevention devices,

including water meters, are fitted the expansion of hot water into

cold water main can be prevented. This can result in a pressure

build-up that may cause damage to the boiler and household

devices such as showers, washing machines etc.

In these cases we recommend that a mini-expansion vessel be

fitted adjacent to the boiler in the cold water pipe.

In Eire advice on backflow protection is given IS813 Annex M4.3

and M4.4.

The connection in the domestic water system should be in

copper pipe.

The domestic hot water circuit of the appliance is suitable for a

mains pressure of up to 10bar. A pressure reducing valve must

be fitted if necessary.

A mains water supply isolating valve is fitted.

The maximum hot water flow rate is set at the factory to 8 l/min

[24i] and 10 l/min [28i] giving a nominal temperature rise of 40

with the temperature control at maximum. This rate is equivalent to

a Specific Rate of 11.2 l/min [24i] and 13.1 l/min [28i] at a rise of

C. Refer to Table 6. The temperature rise, upto the maximum, is

maintained by the automatic modulation of the heat input. In winter

(when the mains water temperature is lower) it may be necessary to

reduce the water flow at the tap or shower to maintain the maximum

delivery temperature.

It is recommended that long pipe runs to taps or showers are

insulated to prevent the rapid cooling of the water.

Hot and cold taps and mixing valves must be suitable for the

available mains pressure.

No anti-syphonage arrangements are necessary for fixed head

showers. The hose of a loose-head shower must be fixed so that

the shower head cannot get closer than 25mm to the top edge of

the bath to prevent its immersion in the water. Alternatively the

shower can be fitted with an anti-syphonage device at the flexible

hose connection. Thermostatically controlled or pressure

balancing shower valves will give extra comfort and guard

against extreme temperature.

Hot and cold mains water direct to a bidet is, subject to the

approval of the local water company, permissible provided that

the bidet is of the overrim flushing type. The outlets must be

shrouded and unable to be fitted with a hand-held spray. No anti-

syphon arrangements are needed.

LIME SCALE: In areas of temporary hardness [>200ppm of

calcium carbonate] it is suggested that a proprietary scale reducer

is fitted in the mains cold water connection to the appliance.

Installation of a scale inhibitor assembly must be in accordance

with the requirements of the local Water Company. The water

hardness can be determined by reference to the local Water

Company.

An isolating valve should be fitted to allow servicing.

The appliance requires a maximum of 2.74 m

/h [24i], 3.17m

[28i] of natural gas (G20) or 1.06 m

/h [24i], 1.23m

/h [28i] of

propane (G31). Refer to Table 7.

A natural gas appliance must be connected to a governed meter.

The installation and connection of the gas supply to the

appliance must be in accordance with BS6891.

The meter (NG) or regulator (LPG) and the pipework to the

appliance must be checked, preferably by the gas supplier, to

ensure that a dynamic pressure of 20mbar for natural gas or

37mbar for propane is available at the appliance (contact gas

supplier if in doubt) equivalent to about 18.5mbar [NG] or

36mbar [LPG] respectively at the gas valve inlet pressure

connection and that the gas flow is adequate for all the installed

gas appliances operating together.

Safety Check: If there is an electrical fault after installation

check for fuse failure, short circuits, incorrect polarity of

connections, earth continuity or resistance to earth.

Mains supply: 230V ~ 50 Hz 150watts.

External fuse 3A to BS1362. Internal fuses F1-T2A, F2-TI.25A

(20mm). Spare internal fuses are supplied with the appliance.

The mains cable must be 0.75mm

(24x0.20 mm) to BS6500 -

Table 16 and must be connected to the terminal ST2 marked L

(red or brown lead), N (black or blue lead) and the Earth stud

(green or green/yellow lead) and secured with the cable clamp.

The Earth lead must still be slack when the other leads are taut.

Refer to Fig 29.

The appliance must be earthed.

The wiring between the appliance and the electrical supply shall

comply with current IEE wiring regulations (and any local reguations

which apply) for fixed wiring to a stationary appliance.

NB. It must be possible to completely isolate the appliance with at

leaste 3mm contact separation in both poles.

A room thermostat or an externally mounted programmer must be

suitable for mains voltage operation. The leads must be securely fixed

in the cable clamps (see Fig 31).

A facia mounted digital programmer or mechanical timer or

receiver for wireless programmable room thermostat is available as

an optional extra. Instructions are supplied with the product.

On very rare occasions it may be necessary to fit an external

frost thermostat to protect remote parts of the system. In this

case refer to the WHS Technical Department for more

information

Tel: 08705 266241 (UK)

. 01 494 0099 (Eire)

11. Electrical9. Domestic Hot Water

10. Gas Supply

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Worcester 28i Junior Especificações Página 10

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